We already have a semi-useless but still cool brick generator. The guy put a lot of work into it and it barely makes basic plates and bricks.As for the other ideas, the engine isn't equipped to handle those functions.
It would be neat if the brick generator could be used in the game and bricks created during a game. Maybe even replacing the plates and bricks tab with just this one tab that can create any square or rectangular brick. Maybe it could also create ramps where you could enter the degree you wanted, if it was a corner or inverted and so on. Also DESTROY THE GRID!